Frost heaving facts for kids
Frost heaving means frozen water in soil. If frozen water doesn't thaw at all, it is permafrost.
Images for kids
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Frost heaves on a rural Vermont road during spring thaw
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Partially melted and collapsed lithalsas (heaved mounds found in permafrost) have left ring-like structures on the Svalbard Archipelago
See also
In Spanish: Levantamiento por helada para niños
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Frost heaving Facts for Kids. Kiddle Encyclopedia.